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Police say the German man suffered severe facial injuries, a broken jaw and fractured cheekbones and was robbed of his personal belongings.

"It's disgusting and embarrassing for us that somebody comes here from another country and this happens within a day of them being in Australia," Detective Acting Superintendent Sam Crisafulli told reporters on Tuesday.

He described the attacks as cowardly and said he was shocked by the ground covered during the spree.

"I haven't seen anything like this in a long time," Supt Crisafulli said.

"It started at West Pennant Hills then came into the city and then ended up in the western suburbs of Sydney, so they've made a lot of ground overnight."

The car was found at Bidwell, in the city's west, and a crime scene has been established.

The injured man is undergoing surgery at St Vincent's hospital with his family believed to be flying from Germany to be by his side.